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Medication Prescriptions in 322 Motor Functional Neurological Disorder

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Medication Prescriptions in 322 Motor Functional Neurological Disorder General Hospital Psychiatry 58 (2019) 94–102 Contents lists available at ScienceDirect General Hospital Psychiatry journal homepage: www.elsevier.com/locate/genhospsych Medication prescriptions in 322 motor functional neurological disorder patients in a large UK mental health service: A case control study T ⁎ Nicola O'Connella, , Timothy Nicholsona, Graham Blackmana, Jennifer Tavenera, Anthony S. Davidb a Institute of Psychiatry, Psychology and Neuroscience, King's College London, 16 DeCrespigny Park, London SE5 8AF, United Kingdom b Institute of Mental Health, UCL Division of Psychiatry, University College London, 6th Floor, Maple House, 149 Tottenham Court Road, London W1T 7BN, United Kingdom ARTICLE INFO ABSTRACT Keywords: Objective: This study describes medication prescribing patterns in patients with motor functional neurological Functional neurological disorder disorder (mFND) treated in South London and Maudsley NHS Foundation Trust (SLaM), comparing outcomes to Functional motor disorder a control group of psychiatric patients from the same hospital trust. Psychosomatics Method: This is a retrospective case-control study using a psychiatric case register. Cross-sectional data were Conversion disorder obtained from 322 mFND patients and 644 psychiatry controls who had had contact with SLaM between 1st Polypharmacy January 2006 and 31st December 2016. Results: A slightly lower proportion of mFND patients received medication compared to controls (76.6% v. 83.4%, OR: 0.59, CI: 0.39–0.89, p < 0.05). Of medication recipients, mFND patients were prescribed a higher number of agents (mean: 4.7 v 2.9, p = 0.001) and had higher prescription rates of antidepressants, anti-epi- leptics, analgesics, and certain non-psychotropic medications. Higher numbers of prescriptions were associated with co-morbid physical conditions, and previous psychiatric admissions. Conclusions: This is the first study to describe medication prescriptions in a large cohort of mFND patients. Patients were prescribed a wide range of psychiatric and physical health medications, with higher rates of polypharmacy than controls. Psychotropic medication prescription is not necessarily the first line treatment for mFND, where physiotherapy and psychotherapy may be offered initially. There is limited, early-phase evidence for pharmacological therapies for mFND, and as such, the benefit-to-risk ratio of prescribing in this complex and poorly understood disorder should be carefully assessed. 1. Introduction the seizure variant of FND, and specialist physiotherapy for motor FND (mFND) [6]. There have been no large randomised controlled trials In functional neurological disorder (FND), also known as conversion (RCTs) of pharmacological treatments and much of the evidence on disorder, patients present with neurological symptoms with no known pharmacotherapy comes from extrapolations from other functional neurological cause [1]. Symptoms commonly include seizures, sensory disorders such as irritable bowel syndrome (IBS), fibromyalgia and (e.g. numbness or visual impairment) and motor symptoms such as multiple functional disorders [1]. A recent FND review states that it is weakness, movement (e.g. tremor, paralysis and dystonia) and gait inappropriate to prescribe medication for functional symptoms speci- disorders. FND is common and associated with high rates of disability fically, although comorbidities like pain and depression may be treated [2], lower quality of life [3,4] and poor prognosis [5]. FND has, until pharmacologically [6]. recently, fallen between the disciplines of Neurology and Psychiatry Of existing pharmacotherapy research in mFND, a small open-label and has been under-researched. Consequently, there is a poor evidence study reported some effectiveness for the antidepressants citalopram base for treatment. and paroxetine [7], although all patients who improved had co-morbid There is emerging evidence for the effectiveness of cognitive be- anxiety or depression. A small, unblinded observational study of 18 havioural therapy (CBT) for psychogenic non-epileptic seizures (PNES), functional patients, of whom nine had paralysis and two had ataxia, ⁎ Corresponding author. E-mail addresses: nicola.k.o'[email protected], [email protected] (N. O'Connell), [email protected] (T. Nicholson), [email protected] (G. Blackman), [email protected] (J. Tavener), [email protected] (A.S. David). https://doi.org/10.1016/j.genhosppsych.2019.04.004 Received 1 March 2019; Received in revised form 1 April 2019; Accepted 2 April 2019 0163-8343/ © 2019 Elsevier Inc. All rights reserved. N. O'Connell, et al. General Hospital Psychiatry 58 (2019) 94–102 reported greater improvement in patients treated with sulpiride com- epileptic medications in mFND. pared to haloperidol, although patients may have improved regardless of drug intervention [8]. There were beneficial responses to both ben- 2. Methods zodiazepines and placebo in a study of 26 patients with ‘psychogenic paroxysmal movement’ disorder [9]. In the seizure variant of FND, a 2.1. Design and source of clinical data pilot double-blind trial found sertraline reduced the frequency of non- epileptic seizures [10] and an open-label study of patients with PNES This was a retrospective case-control study which includes patients and anxious and depressive symptoms treated with venlafaxine also in contact with South London and Maudsley (SLaM) Foundation Trust, reported seizure reductions and improvements in co-morbid anxiety between 1st January 2006 and 31st December 2016. and depression [11]. Data were obtained from the SLaM Biomedical Research Centre's In other functional disorders, pharmacological guidelines differ but (BRC) Clinical Records Interactive Search (CRIS) database which con- antidepressant use is common [12]. Low-dose imipramine has been tains anonymised electronic health records of over 250,000 individuals found to improve overall health in patients with multiple functional referred to SLaM services [38]. SLaM provides inpatient and commu- symptoms compared to placebo [13], and there is low-quality evidence nity services for a catchment of 1.5 million people living in southeast for the efficacy of new-generation antidepressants in unexplained London. The trust also receives national referrals for FND patients. physical symptoms [14]. Within specific disorders, antidepressants We retrieved medication information from searches of the databa- have shown improvements in IBS [15,16], chronic pain [17] and so- se's free clinical notes fields. As some patients had contact with SLaM matoform pain disorder [18], with some evidence for their efficacy in over the course of years, the most contemporaneous medication in- patients without concomitant mood disorders [13,19]. Most studies do formation was collected from each participant, representing a cross- not screen for comorbidities however, and the mechanisms of anti- sectional snapshot at one timepoint, rather than a cumulative retro- depressant effectiveness are poorly understood [20]. spective list of medications. In some cases, no information was available Medication prescriptions rates are high across functional disorders. on medication at all. This was marked, ‘not known’. Given our data High prescription rates have been reported in patients with ‘psycho- collection method and the necessary trade-off between capturing rich genic jerky movement disorder’ and in patients with unexplained pain, clinical information on a wide range of variables and increasing our compared to Tourette's patients and those with pain disorders respec- sample size, we capped the number of medications we recorded per tively [21,22]. Opioid prescriptions varied between 28 and 36% in patient at 12. Strictly, this should be interpreted as “12 or more med- patients with unexplained gastrointestinal symptoms, fibromyalgia, and ications”. We calculated the total number of medications each partici- chronic fatigue [23–25] and higher rates of benzodiazepines, gastric pant was prescribed. We further categorised each drug based on their reflux medications, inhalers and blood pressure medications have been therapeutic properties, guided by the NICE British National Formulary reported in PNES compared to epilepsy patients [26,27]. Patients with (BNF) [39]. Our classification led to a total of 27 drug categories. functional symptoms in primary care have been reported to have higher rates of both psychotropic and somatic medications compared to con- 2.2. Study setting and participants trols [28]. The lack of pharmacotherapy evidence in mFND means prescribing Cases were defined as any patient aged over-18 years with a primary patterns will vary and may be more likely to be in fluenced by a range of or secondary diagnosis of ‘Conversion disorder with motor symptom or individual and systemic factors than prescriptions in non-FND patients. deficit’ (ICD-10 code: F44.4) who had contact with SLaM services. In While psychiatrists will prescribe for common mFND comorbidities addition, patients with any F44 diagnosis were included if there was such as insomnia, pain, depression, anxiety and panic [29,30], clin- evidence of functional motor symptoms in their unstructured case notes icians may also be influenced by patients' personal characteristics [31], or correspondence (see “Supplementary materials” for a comprehensive symptom severity and treatment preferences [12]. Some GPs have de- list of search strategies). scribed using prescriptions for patients with unexplained symptoms on Our control group comprised
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